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A223576 as a simple table

na(n)
13
29
39
427
581
627
781
8729
9729
1081
11243
126561
1316038
146561
15243
16729
1759049
18352836
19352836
2059049
21729
222187
23531441
247762392
2516230456
267762392
27531441
282187
296561
304782969
31170772624
32746600976
33746600976
34170772624
354782969
366561
3719683

[3,9,9,27,81,27,81,729,729,81,243,6561,16038,6561,
 243,729,59049,352836,352836,59049,729,2187,531441,
 7762392,16230456,7762392,531441,2187,6561,4782969,
 170772624,746600976,746600976,170772624,4782969,
 6561,19683]